I remember R’ Shlomo Zalman Braun the Shiurim Mezuyanim Behalocho having his son go out Shabbos morning to shovel the snow inside the gates in from of his shul.
A few years ago, R’ Shlomo Miller wrote (in a short-lived Yated halacha column) that minimal shoveling is mutar; I think he said the only issur is uvdin d’chol. There was a controversy in a certain city a number of years ago when a rov moved in and was seen shoveling on Shabbos; another rov took him to task for it (and I believe ultimately retracted).
However, Zahavasdad made the statements that YOUR SHABBOS does not overule my shabbos or my right to even walkand that The MAIN issue is SAKANA, and the SAKANA is very real., implying that it would be mutar even if chillul Shabbos was invoved, e.g. a r’shus harabim.